Lets make sure everyone has this straight. An appraiser carries E & O insurance in case there is a law suit. It is for the protection of the appraiser. If you feel you have been damaged, hire an attorney. The attorney may decide to file a law suit against the appraiser IF there is evidence of negligence on the part of the appraiser. Once that suit or action is filed, the appraiser then notifies his/her E & O company which, in turn, will defend the appraiser. There is a whole laundry list of things that are exclusions from coverage under errors and omissions.
As I said in another thread where you posted your problem...your next step is to consult your attorney. The attorney will decide if there is a case but I would caution you ... it is going to cost money. If you win the appraiser pays, if you lose, you pay.
Even if the appraiser did, as you claim, not do an interior inspection of the property, there might not be grounds for claiming damages. Usually what happens is the attorney will order another appraisal. If that appraisal is substantially different from the one in question there could be grounds for a law suit claiming damages.
Attn: moderators, this thread and the other one by the same poster should be moved to ASK AN APPRAISER.